Journal ArticleDOI
Visualization of three-dimensional flow in a four-roll mill
R. R. Lagnado,L. G. Leal +1 more
Reads0
Chats0
TLDR
In this paper, the effect of increasing Reynolds number on the evolution of steady three-dimensional flow between the rollers is reported, showing that an increase in Reynolds number beyond this critical value results in a loss of symmetry in the flow pattern.Abstract:
Flow visualization has been used to study the motion of a Newtonian fluid in a four-roll mill. Observations of the effect of increasing Reynolds number on the evolution of steady three-dimensional flow between the rollers are reported. The flow visualization experiments have been conducted for two values of the aspect ratio (defined as the ratio of roller length to gap width between rollers). The rollers have been constrained to rotate in a manner which generates an approximately two-dimensional pure extensional flow near the center of the apparatus at low speeds. Steady, symmetrically positioned vortices grow near the top and bottom walls of the container as the Reynolds number is increased up to a critcal value. An increase in Reynolds number beyond this critical value results in a loss of symmetry in the flow pattern. The nature of this transition is strongly dependent upon the aspect ratio.read more
Citations
More filters
Journal ArticleDOI
Quantitative diagnosis of malignant pleural effusions by single-cell mechanophenotyping.
Henry T. K. Tse,Daniel R. Gossett,Yo Sup Moon,Mahdokht Masaeli,Marie Sohsman,Yong Ying,Kimberly Mislick,Ryan P. Adams,Jianyu Rao,Dino Di Carlo +9 more
TL;DR: De deformability cytometry should be useful as a quick screening tool to form an early diagnosis of MPEs, and an algorithmic diagnostic scoring system was developed on the basis of quantitative features of two-dimensional distributions of single-cell mechanophenotypes from 119 samples.
Journal ArticleDOI
Microdevices for extensional rheometry of low viscosity elastic liquids: a review
TL;DR: Extensional flows and the underlying stability/instability mechanisms are of extreme relevance to the efficient operation of inkjet printing, coating processes and drug delivery systems, as well as for the generation of micro droplets as mentioned in this paper.
Journal ArticleDOI
Universal scaling for polymer chain scission in turbulence
TL;DR: This paper reconciles existing anomalies between theory and experiment with the hypothesis that the local stress at the Kolmogorov scale generates the molecular tension leading to polymer covalent bond breakage and yields a universal scaling for polymer scission in turbulent flows.
Journal ArticleDOI
Microfluidic extensional rheometry using stagnation point flow.
TL;DR: This review begins with a general discussion of extensional viscosity and the requirements of an extensional rheometer, before various types of extension rheometers (particularly those of microfluidic design) are critically discussed.
Journal ArticleDOI
Flocs in Shear and Strain Flows.
TL;DR: Preflocculated ferric hydroxide flocs were subjected to either a simple shear flow or a two-dimensional straining flow, and their motion was optically observed, finding their motion can be understood from the behavior of a solid ellipsoid.
References
More filters
Journal ArticleDOI
Stability of a Viscous Liquid Contained between Two Rotating Cylinders
TL;DR: In this paper, it was shown that if the velocity of the fluid exceeds a certain limit, depending on the viscosity of the viscous fluid and the configuration of the boundaries, the steady motion breaks down and eddying flow sets in.
Journal ArticleDOI
The formation of emulsions in definable fields of flow
TL;DR: The physical and chemical condition of emulsions of two fluids which do not mix has been the subject of many studies, but very little seems to be known about the mechanics of the stirring processes which are used in making them.
Journal ArticleDOI
Dispersion phenomena in high viscosity immiscible fluid systems and application of static mixers as dispersion devices in such systems
TL;DR: In this article, the authors discuss the role of statics in high-viscosity IMMISCIBLE FLUID systems and the application of mixers as disphers.
Journal ArticleDOI
An experimental investigation of drop deformation and breakup in steady, two-dimensional linear flows
B. J. Bentley,L. G. Leal +1 more
TL;DR: In this article, the deformation and burst of small fluid droplets in steady linear, two-dimensional motions of a second immiscible fluid were investigated using a computer-controlled, four-roll mill to investigate the effect of flow type.
Journal ArticleDOI
Particle motions in sheared suspensions XII. Deformation and burst of fluid drops in shear and hyperbolic flow
F.D Rumscheidt,S. G. Mason +1 more
TL;DR: In this paper, the deformation, orientation, and burst of fluid drops suspended in a liquid subjected to both hyperbolic and shear flow have been measured for a large number of fluid pairs covering a wide range of viscosity ratio p. At low deformation excellent agreement, with theoretical equations due to Taylor and Cerf was found.